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Finding the Fourth Proportional to 256.76, 384.45 and 134.77

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Solution

The fourth proportional to 256.76, 384.45 and 134.77 is: 201.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.76 : 384.45 = 134.77 : x
  2. Step 2: Convert to fraction form
    256.76/384.45 = 134.77/x
  3. Step 3: Cross multiply
    256.76x = 384.45 × 134.77
  4. Step 4: Simplify right side
    256.76x = 51,812.33
  5. Step 5: Solve for x
    x = 51,812.33/256.76
  6. Step 6: Final answer
    x = 201.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.